Insight into the reversible behavior of Lewis–Brønsted basic poly(ionic liquid)s in one-pot two-step chemical fixation of CO2 to linear carbonates. Issue 21 (13th October 2021)

• Record Type: Journal Article
• Authors: He, Yuting; Lu, Huimin; Li, Xue; Wu, Jun; Pu, Tiancheng; Du, Wei; Li, Hongping; Ding, Jing; Wan, Hui; Guan, Guofeng
• Is Part Of: Green chemistry. Volume 23:Issue 21(2021)
• Page Start: 8571
• Page End: 8580
• Publication Date: 2021-10-13
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/d1gc02539b
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : Novel Lewis–Brønsted binary basic PILs were applied to the two-step synthesis of linear carbonates, providing sufficient support for the ingenious incorporation of the reversible regeneration of basic catalysts and multi-step reaction of CO2 . Abstract : The multi-step reaction of CO2 over basic catalysts significantly improves the diversity of products, vividly embodying the ability of green chemistry to turn waste into treasure. However, under a Lewis acidic CO2 atmosphere, the activity maintenance of the multi-step reaction puts forward higher requirements for the reversible regeneration ability of the basic catalysts. Novel Lewis–Brønsted binary basic poly(ionic liquid)s (LB-PILs) were successfully developed through a radical copolymerization followed by ion-exchange strategy, and were applied to the two-step synthesis of dimethyl carbonate (DMC) by coupling CO2 cycloaddition and CH3 OH transesterification without any cocatalyst. Relying on the activation of CO2 by Lewis basic tertiary N and the thermal recovery of nucleophilic HCO3 − to stronger Brønsted basic OH − with the help of temperature control in CH3 OH transesterification, the LB-PILs presented high activity, stable repeatability and linear carbonate universality. In situ IR analysis and Knoevenagel condensation, combined with theoretical calculations, provided reliable support for the ingenious incorporation of reversible regeneration of basic catalysts in a Lewis acidic CO2 atmosphere and multi-step coupling reaction process of CO2 .